The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Nowadays, research on the reliability improvement of T-type three-level inverters is studied as an important issue. In this paper, a novel fault tolerant control strategy based on model predictive control (MPC) is proposed for open-circuit faults in switch devices. When an open-circuit fault occurs to neutral-point switches, the impossible switching states of zero- and small-voltage vectors should...
This paper investigates an economic and highly efficient power converter topology and its modulation scheme for 60kW buck-type rectifier system. The target system consists of three-phase three-switch buck-type rectifier topology. A new Carrier Based PWM scheme along with its simple implementation using logic gates is introduced. This PWM scheme replaces the diode rectifier equivalent switching state...
This paper proposes a current-source parallel resonant Class E inverter with low peak switch current. The proposed circuit consists of two switches, a parallel resonant circuit, a capacitor, an inductor, a choke inductor, and a DC voltage source. The peak current flowing through the switches is no more than the input current, which reduces the current stress of the switching devices. Zero-voltage...
This paper presents Direct Power Control (DPC) based on instantaneous power theory is presented. The simulation of a grid connected five level inverter via an inductive filter with a new direct power strategy is used. However, this control method is similar to the classic DPC method, in which used triangles instead of the sectors. Furthermore, the regulation of DC link without interfering the hysteresis...
This work presents the operation of a PCB-embedded diode-clamped multilevel-converter integrated circuit (IC) fabricated in a lateral, high-voltage AlGaN/GaN-on-Si heterojunction technology. It is demonstrated, that PCB-embedding is an appropriate assembly technique for lateral power ICs with high-integration levels. By placing DC-link capacitors onto the IC-package, parasitc inductances in the power...
A novel space vector PWM (SVPWM) strategy is proposed in this paper to balance the neutral-point voltage (NP) and the floating capacitor voltage for five-level active neutral-point-clamped (ANPC) converter. There are two different switching sequences in each small area. According to the NP offset, different switching sequences are used to control the NP voltage. Since the charge-discharge of the floating...
This paper considers a unique type of multitude DC/DC conversion ratios switched capacitor converter. The multitude conversion ratios enable the converter to be able to be almost continuous and competitive to inductive based converters. The paper summarizes the basic rules of the topology as well as presenting two possible ways of implementing the topology. The paper also discusses the difference...
In this paper, a novel interleaved boost converter topology is introduced. The proposed converter is based on a combination of two types of voltage multiplier cells (VMC): Dickson and Cockroft-Walton (CW) voltage multiplier. Connecting VMCs to an interleaved boost stage yields many benefits, including smaller ripples on the input current, reduced voltage stress across switches and capacitors, and...
A silicon carbide (SiC) vertical field effect transistor (VJFET) with ultra-low feedback capacitance Crss has been developed, which is called as screen grid VJFET (SG-VJFET). The SG-VJFET is a very promising power device because of the superior static characteristics such as normally off, low on-resistance, and high breakdown voltage, furthermore, issueless in terms of gate oxide reliability and long-term...
Modular multilevel converters (MMC) have shown a great potential in the area of medium-voltage drives, for it can produce excellent output waveform with low average switching frequencies. A key issue of MMC is that it requires a complex voltage balancing method to balance the capacitor voltage of each submodule (SM). In this paper, a medium-voltage motor drive based on diode-clamped modular multilevel...
This paper proposes new step-up DC-DC converters with high ratio capability. The proposed DC-DC converters are derived using combination of boost converters and buck-boost converters. A high ratio capability is achieved by parallel input and series output combination so that the efficiency is better than the one that is achieved by using a conventional boost converter. A method to reduce the input...
This paper presents a new implementation of flyback-type inverter to optimize power flow from solar PV (photovoltaic) system. The flyback-type inverter used is Shimizu topology. The main features of this inverter type include: extended lifetime of the inverter, provide small volume, lightweight, lower harmonic content and stable AC current injection into the load or utility line. Three controllers...
Flying capacitor multilevel (FCML) converters are known to naturally balance the capacitor voltages through the use of phase-shifted pulse-width modulation. However, in practice, the capacitor voltages can still deviate and active balancing is often required. This work investigates the origins of the voltage imbalance in practical implementations of such converters and presents corresponding solutions...
Continuous conduction mode (CCM) boost power factor corrector (PFC) is widely used for high power applications such as server power supply. PFC performs AC/DC conversion with nearly unity power factor (PF) and low current harmonic distortion. However, the electromagnetic interference filter capacitors in front of the bridge diode and input filter capacitor behind the bridge diode incur phase leading...
In this paper, a versatile, re-programmable, current-input bioinstrumentation board is presented for electrochemical amperometric measurements. The proposed instrument has been fabricated on a six layer printed circuit board (PCB) and exploits dual switched-capacitor (SC) integration and sample-and-hold (SH) techniques. It comprises off-the-shelf switch and amplifier ICs and a commercially available...
This paper introduces a multi-string quasi-resonant driver for LED lighting applications. The proposed LED driver is operated with variable frequency, constant on-time control strategy. Key characteristics of the proposed driver under the proposed control method are reported. The theory is verified by simulation and experimental results.
paper proposes application of a DC/DC Z-Source Converter (ZSC) based on the one-port impedance network, operating in continuous conduction mode (CCM) for solar power generation in DC microgrid. A photovolaic array is connected to the input of ZSC, which provides voltage gain from 167V. The nominal input power of arrangement was 1440 Watts. Attending the low efficiency of photovoltaic modules (PV)...
This paper reports 2.37–5.94 GHz multicore CMOS LC Digitally-Controlled Oscillator (DCO) designed in 65 nm RF CMOS technology. The three cores of 6-bit switch capacitor array provides wide LC-DCO tuning range. With 1.8 V supply voltage, simulation results show that the tuning range is from 2.37 GHz to 5.94 GHz, while average phase noise value across the entire tuning range is −135 dBc/Hz. Power dissipation...
This work develops a novel single-switch current-fed series-parallel resonant converter for use in direct current (DC) energy conversion systems. The converter comprises a class-E inverter and a series-parallel resonant tank with a bridge rectifier. It uses a single active power switch to reduce the cost of the energy conversion system and control circuits. With a simple circuit configuration and...
A multiple input non-isolated DC-DC converter with improved reliability is presented in this paper. The proposed converter can supply energy from storage and renewable energy sources independently to the load. It can work in buck, boost and buckboost modes depending on the operating conditions. It has the ability to maintain constant output voltage during transient conditions of load as well as source...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.